/Engine/Source/Runtime/Engine/Classes/Animation/AnimCompress.h
Common compression utility to walk an array of rotation tracks and enforce that all adjacent rotation keys are represented by shortest-arc quaternion pairs.
static void PrecalculateShortestQuaternionRoutes ( [TArray](API\Runtime\Core\Containers\TArray)< struct [FRotationTrack](API\Runtime\Engine\Animation\FRotationTrack) > & RotationData )